FFXIIRW
The Tyrfing is Basch's lightning weapon that provides +90 Attack, +45 Magic Attack, has an attack speed of 30. Some take the description to suggest that each attack costs a little HP, in the style of a Dark Knight, but testing indicates that there is no such cost, or it is so minuscule that it can't be measured. The Tyrfing uses a generic knightsword sprite during battle. It is forged with the Hammer of Lightning recipe book.

Dissidia
The Tyrfing is a level 50 exclusive weapon for Onion Knight and provides +36 Attack and Damage +5%. It can be obtained from the shop by trading 15,460 gil, Rapier, Spirit Stone x3, and Recovery Shard x2.

[view·edit·purge]Tyrfing was a magic sword in Norse Mythology. In the Poetic Edda, Tyrfling was the sword of the Goth heroes, forged by Dwarves Dvalinn and Durin for the King Svafrlami who had trapped them. In the heroic tales it gleamed like fire, would never rust or miss, and could cut through iron as easily as cloth. However, the Dwarves also cursed it so that it would kill a man every time it was drawn and would also commit three evil deeds.